The Umbral Foundry is one of the most demanding zones in Borderlands 4, not only for its combat encounters but also for the sheer number of collectibles scattered throughout. This full walkthrough will guide you step by step through every chamber, ensuring you gather every item without missing a single one.

The first chamber is deceptively simple. After eliminating initial enemies, scan both sides of the room carefully. Collectibles are often tucked behind machinery, while others can be found inside crates. Beginners frequently overlook the corners, so sweeping the entire room is essential before moving on.

The second area features the conveyor belts. Here, collectibles are placed on edges and under rotating pistons. Patience is critical, as rushing across belts can cause you to miss items. Take time to study the movement cycles, then cross carefully to retrieve everything.

The forge chamber introduces a vertical challenge. Begin by climbing to the top platforms, where several collectibles are hidden behind gears and pipes. Once the upper level is cleared, drop down to the ground floor to collect remaining items, avoiding unnecessary climbing.

In the molten chamber, hazards are everywhere. Steam vents and lava flows conceal multiple collectibles. Disable valves whenever possible before moving near these traps, as rushing into them can lead to unnecessary deaths and lost progress.

The scrapyard presents a different challenge. This area is cluttered with piles of debris and broken machinery. To collect everything, move systematically in a grid pattern, clearing one section at a time. Jumping on higher stacks of junk reveals hidden collectibles often missed by players.

Transition tunnels leading to the final arena hide more items. These narrow passages are easy to rush through, but pausing to check behind pipes and alcoves is necessary to avoid missing collectibles.

The boss arena combines combat with collection. Defeat smaller enemies first to create a safe window, then circle the arena walls to gather hidden collectibles before finishing the fight. Many players exit too quickly and leave valuable items behind.

After defeating the boss, do not immediately exit the Foundry. Instead, conduct a final sweep of all chambers, using a methodical backtrack to confirm 100% completion. This step prevents the frustration of realizing you missed a collectible earlier.

By following this complete walkthrough, players can secure every collectible in the Umbral Foundry in a single run, combining efficient combat with careful exploration. 

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